linux-kernel - Re: Quad core CPUs loaded at only 50% when running a CPU and mmap intensive multi-threaded task

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Message-Id: <1219660582.8515.24.camel@twins>
Date:	Mon, 25 Aug 2008 12:36:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Török Edwin <edwintorok@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, rml@...h9.net,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"Thomas Gleixner mingo@...hat.com" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: Quad core CPUs loaded at only 50% when running a CPU and mmap
	intensive multi-threaded task

On Mon, 2008-08-25 at 13:22 +0300, Török Edwin wrote:

> Well, the real program (clamd) that this testprogram tries to simulate 
> does an mmap for almost every file, and I have lots of small files.
> 6.5G, 114122 files, average size 57k.
> 
> I'll run latencytop again, last time it has showed 100ms - 500ms latency 
> for clamd, and it was about mmap, I'll provide you with the exact output.

Right - does it make sense to teach clamav about pread() ?

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